Channel Access Procedure Using Unit Bandwidth Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing channel access procedures in unlicensed high-frequency bands, particularly in coexisting with other communication systems, due to limitations in bandwidth management and energy detection thresholds.
Innovation Solution
A method and apparatus for performing channel access procedures in wireless communication systems, involving the user equipment (UE) and base station (BS), which include configuring unit bandwidth for listen before talk (LBT), obtaining energy detection thresholds and maximum output power, and transmitting signals based on these parameters to efficiently manage channel occupancy time and coexist with other systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the unit bandwidth for LBT is increased to improve channel access efficiency, then the channel occupancy time increases, but the coexistence with other communication systems deteriorates
Solution Approach 1:
The patent segments the total bandwidth into multiple unit bandwidths for LBT operations. Each unit bandwidth performs independent LBT with appropriate ED thresholds, allowing partial channel access rather than all-or-nothing access. This segmentation enables the system to access available frequency resources while limiting interference impact to specific bandwidth portions only.
Solution Approach 2:
The patent applies different ED thresholds to different unit bandwidths based on local channel conditions and coexistence requirements. Each unit bandwidth can have customized LBT parameters tailored to its specific interference environment, allowing aggressive access in low-interference bands while being conservative in high-interference bands.
2Productivity
If the energy detection threshold is increased to allow more channel access opportunities, then the channel occupancy time increases, but the measurement precision of channel availability deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of ED thresholds based on channel conditions, historical access success rates, and coexistence requirements. The ED threshold is not fixed but adapts over time, increasing when channel conditions are favorable and decreasing when interference risks are detected, thereby maintaining both access opportunities and detection accuracy.
Solution Approach 2:
The patent changes the ED threshold parameter based on unit bandwidth size and channel characteristics. Different unit bandwidths have different ED thresholds optimized for their specific frequency ranges and interference environments, allowing the system to maintain measurement precision while maximizing access opportunities across the spectrum.
3Reliability
If the maximum output power is increased to improve signal transmission quality, then the channel occupancy time increases, but the harmful factors generated by the system increase
Solution Approach 1:
The patent segments power transmission across multiple unit bandwidths rather than transmitting maximum power across the entire bandwidth simultaneously. Each unit bandwidth transmits at appropriate power levels based on its specific channel conditions and LBT results, reducing overall interference while maintaining transmission quality in accessed bands.
Solution Approach 2:
The patent applies different output power levels to different unit bandwidths based on local channel conditions, distance to receiver, and interference environment. Each unit bandwidth transmits at the minimum necessary power to achieve reliable communication, avoiding excessive power transmission that would create harmful interference.
Data Source
AI summary
The present disclosure provides a method for transmitting an uplink signal by a terminal in a wireless communication system. Specifically, the method comprises: receiving information related to the size of a unit bandwidth (BW) for listen-before-talk (LBT); obtaining an energy detection (ED) threshold and maximum output power associated with the unit bandwidth; performing the LBT on the basis of the unit bandwidth and the ED threshold; and transmitting an uplink signal on the basis of a result of the LBT and the maximum output power.